It's also based on recall info deficiency issues and warranty service and repair I do.
I'm commenting on the highest amount of issues I see by brand and by install.
Most installers as well do not take time to teach, answer questions and be stewards to the industry.
If they won't make the effort to earn your business by going the extra mile then they don't deserve your business.
Most important is to always buy extended warranty as you will use it!!! Not buying it will put you in the hook for expensive repairs, arguments you can avoid and unnecessary stress.
Make sure before you hook up new equipment you clean the ducts and use a company that has some idea what they are doing. I specialize in it so I could be considered if you wish?
I see allot and fix a record number of issues and violations missed by installers and city inspectors.
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